package com.hmdp.service.impl;

import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONUtil;
import com.hmdp.dto.Result;
import com.hmdp.entity.ShopType;
import com.hmdp.mapper.ShopTypeMapper;
import com.hmdp.service.IShopTypeService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.RedisConstants;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class ShopTypeServiceImpl extends ServiceImpl<ShopTypeMapper, ShopType> implements IShopTypeService {

    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result getList() {
        //先从redis中查询类型列表
        String typeKey = RedisConstants.CACHE_TYPES_KEY;

        String typesJson = stringRedisTemplate.opsForValue().get(typeKey);

        //判断是否存在
        if (StrUtil.isNotBlank(typesJson)) {
            List<ShopType> typeList = JSONUtil.toList(typesJson, ShopType.class);
            return Result.ok(typeList);
        }

        //不存在
        List<ShopType> typeList = this.baseMapper.selectList(null);

        stringRedisTemplate.opsForValue().set(typeKey, JSONUtil.toJsonStr(typeList));

        return Result.ok(typeList);
    }
}
